It is not allowed to sit on a table having alcohol, but if you sit on a table which has no alcohol on it, it is allowed provided that you sitting in such place will not encourage others to be customers and drink alcohol.
If that really was the case, and you are a Shi'i Muslim, then the divorce is invalid and has no effect.
There are numerous conditions for an Islamic divorce to occur, and from what you have said, none of them have been met. Therefore, she is still your wife.
You do need to deal with your alcoholism. As a Muslim, you know of its severity and how spiritually, morally and socially damaging drinking is.
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